2017.06.19 FwdMan2.8.17.docx 17-145
The D valve is only used to “convert” LOWER CATCH mode to RAISE PLATE mode
(which will also lower the catch).
Note that if plate is not low, then RAISE WEIGHT as well as DROP mode will cause the
plate to be lowered and the two side cylinder shafts to be fully extended, before the relevant
mode becomes active.
17.6.2 b) Checking the Hydraulic Modes
If any mode fails when operated from the pushbuttons of the Compact15, and this is not due
to a blown fuse, a defective proximity sensor, etc. (see 16.3, 16.5, 16.7 and 16.8), then check
that the indicator lamps of the plugs of the relevant solenoids for the mode in question are lit
while the mode is activated. If not, then likewise check that the relevant LED(s) next to the
relevant connection socket(s) on the Compact15 front panel are turning on, when the mode is
activated.
17.6.3 c) Checking the Hydraulic Solenoids/Valves
If (for any mode) the solenoids DO receive correct POWER, but the mode fails, then the error
may be located in a valve solenoid or valve element.
First connect a jumper (preferably protected with a 16A fuse) from battery positive terminal
to the hot terminal of each solenoid in succession (except for the M solenoid which has been
checked in step 5) and check that each valve pulls (can be heard as a weak “click” sound). If
no reaction, then use an ammeter (range 3ADC min.) as “jumper” and monitor the current in
each of the solenoids. A and B current should be at least 2 amps, C and D at least 1 amp. If
current is too low, then the solenoid may be defective and should be exchanged (do not over
tighten the lock nut!).
If a solenoid current is OK, but the valve does not “click”, then the valve element may be
defective, or maybe the valve plunger is stuck due to dirt in the hyd oil.
The A/B valve may be checked further by pressing a rod into the end of one of the solenoids,
which must equivalate powering of the respective solenoid. So, NO change should be
observed when pressing B valve WHILE the LP/RW button is pressed (or A valve WHILE
the LC or RP button is pressed) but before trying this, make sure that the opposite solenoid is
not powered due to an electrical error. If A and B solenoids are both powered at the same
time, then the valve will either stay in the neutral position, OR ANY of the two solenoids may
“win” and pull.
17.6.4 d) Hydraulic Solenoids Driver Circuits
If a mode fails, and this is due to a missing voltage to a solenoid, then first check that the
mode WILL work if a jumper (16A fused) or an ammeter (range 3ADC min.) is connected
from battery positive terminal (OR from wire No. 6) to the hot terminal of the solenoid in
question, WHILE the mode that failed is activated.
If so, then driver circuit(s) (solid state switch(es)) of the Compact15 may be defective.
To Next Page
Loading...